Swift Quick Syntax Reference

Chapter    16

Ternary Conditional Operator

You use the ternary conditional operator to evaluate a question and then do one of two things based on the result of the question. The ternary conditional operator is written like this: question ? action1 : action2 (see Listing 16-1).

The question is an expression that returns a boolean true or false. If the question returns true, then the first action takes place. If the question returns false, then the second action takes place.

Listing 16-1. Ternary Conditional Operator

let a = 5a == 5 ? "We're good" : "O0ps, not quite"

In Listing 16-1, the first part of the ternary conditional operator is the statement a ==5, which is using the equality comparison operator to test to see whether a is equal to 5. ...